diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 2afdafb..dc6f364 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -90,6 +90,7 @@
 			  struct task_struct *new_parent);
 extern void __ptrace_unlink(struct task_struct *child);
 extern void ptrace_untrace(struct task_struct *child);
+extern int ptrace_may_attach(struct task_struct *task);
 
 static inline void ptrace_link(struct task_struct *child,
 			       struct task_struct *new_parent)